package controller;

import model.Blog;
import model.BlogDao;
import model.User;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/blogDelete")
public class BlogDeleteServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.检测当前用户是否登录
        HttpSession session=req.getSession(false);
        if(session==null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前尚未登录,不能删除");
            return;
        }
        User user=(User)session.getAttribute("user");
        if(user==null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前尚未登录,不能删除");
            return;
        }
        //2.获取参数中的blogId
        String blogId=req.getParameter("blogId");
        if(blogId==null||"".equals(blogId)){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前blogId参数不对");
            return;
        }
        //3.获取一下要删除的博客信息
        BlogDao blogDao=new BlogDao();
        Blog blog=blogDao.selectOne(Integer.parseInt(blogId));
        if(blog==null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前要删除的博客不存在");
            return;
        }
        //4.再次校验,当前的博客是否是博客的作者
        if(user.getUserId()!=blog.getUserId()){
            //这一点在前端这里其实也处理过~~
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前登录的用户不是作者");
            return;
        }
        //5.删除博客
        blogDao.delete(Integer.parseInt(blogId));

        //6.重定向到博客列表页
        resp.sendRedirect("blog_list.html");
    }
}
